Authors: Atul Gawande
What is nausea, this strange and awful beast? The subject gets little attention in medical school, and yet, after pain, nausea is the most frequent complaint for which people consult physicians. It is a typical side effect of drugs. Among surgery patients, vomiting after anesthesia is so common that an “emesis basin” is kept at the side of every bed in the recovery room. A majority of chemotherapy patients suffer nausea, and they consistently rank it as the worst part of the treatment. From 60 to 85 percent of pregnant women experience morning sickness or “pregnancy sickness,” and a third of those who are employed miss work as a result of it. In about five in a thousand pregnant women, the condition is so severe as to cause substantial weight loss—a condition termed “hyperemesis of pregnancy.” And, of course, motion sickness afflicts virtually all of us at some point in our lives. Seasickness has been a major military concern dating back to ancient Greece. (The word
nausea
comes from the Greek word for ship.) Cybersickness continues to hobble the development of virtual reality devices. And space sickness is a frequent, though rarely mentioned, problem for astronauts.
The most striking thing about nausea is that it is so intensely aversive (Cicero claimed he “would rather be killed than again suffer the tortures of seasickness”), and not just in the moment. Long after the pain of childbirth fades from memory, mothers will vividly recall their experience of nausea; it is even a reason that some women don’t want to bear more children. Nausea is remarkable in this way. Break a leg on a ski slope and—as bad as traumatic pain can
be—once you can, you’ll ski again. After one unfortunate experience with a bottle of gin or an oyster, by contrast, people won’t go near the culprit for years. In Anthony Burgess’s A
Clockwork Orange
, the authorities programmed Alex away from brutality by coupling his violent urges with feelings of nausea, not of pain. At one time, some German towns made similar efforts. An 1843 manuscript relates that delinquent juveniles used to be put inside a box outside town hall, whereupon a policeman spun the box around at high speed until the youths had provided the gathered crowd with a “disgusting spectacle.”
The sheer loathsomeness of nausea and vomiting does seem to serve a biological purpose. The benefit of vomiting after eating something poisonous or tainted is obvious: the toxin is expelled. And the dreadfulness of the accompanying nausea deters you from ever wanting to eat anything like it again. This explains why pills, chemotherapy, and general anesthetics so often cause nausea and vomiting: they are poisons—albeit controlled ones—and the body is designed to reject them.
Why other things cause nausea and vomiting is more difficult to explain, but scientists are beginning to see some sense in nature’s design. You’d think that pregnancy sickness, for example, would be evolutionarily disadvantageous, since a growing embryo needs nutrition. In a famous 1992 paper, however, the evolutionary biologist Margie Profet made a compelling case that pregnancy sickness is actually protective. She pointed out that natural foods that are safe for adults commonly turn out to be unsafe for embryos. All plants produce toxins, and in order to be able to eat them we have evolved elaborate detoxification systems. But these systems don’t eliminate harmful chemicals completely, and embryos can be sensitive to even tiny amounts. (For example, toxins in potatoes have been found to cause neural malformations in animal fetuses, even at levels that are
nontoxic to their
mothers; indeed, Ireland’s heavy potato consumption may account for its having the world’s highest rate of neural defects, such as spina bifida.)
Pregnancy sickness, Profet suggested, may have evolved to reduce an embryo’s exposure to natural toxins. She pointed out that women with pregnancy sickness strongly prefer bland foods that do not spoil easily (like breads and cereals) and are particularly averse to foods associated with high levels of natural toxins, such as bitter or pungent foods and animal products that are not extremely fresh. The theory also explains why sickness occurs mainly during the first trimester. That is when the embryo develops organs and is most sensitive to toxins; at the same time, it is small and its calorie needs are easily supplied by the mother’s fat stores. Overall, women with moderate to severe morning sickness have a lower rate of miscarriages than women with mild nausea or none at all.
The purpose of motion sickness is harder to account for. In 1882, the Harvard psychologist William James observed that certain deaf people were immune to seasickness, and since then a great deal of attention has been focused on the role of the vestibular system—the inner ear components that enable us to track our position in space. Scientists came to believe that vigorous motion overstimulates this system, producing signals in the brain that trigger nausea and vomiting. But as Charles Oman, an M.I.T. aerospace physiologist, points out, this theory could not explain many characteristics of motion sickness: why activities like running, jumping, or dancing almost never produce sickness, whereas motion that isn’t under your control—for example, being flung around the Gravitron at the county fair—does; why drivers of cars or pilots of aircraft are much less susceptible than passengers; and why sickness tends to diminish with experience. Motion sickness can occur without any motion at—all as with cybersickness or, a related phenomenon, “cinerama sickness,” which comes from watching very wide-screen movies. Oman found that among the most provocative stimuli for space sickness in astronauts is simply seeing another astronaut float by upside down, which can produce a sudden, nauseating perception that you are the one who is upside down.
Researchers have now established that motion sickness occurs when there is a conflict between the motion we experience and the motion we expect to experience. Merely to balance our heads on our shoulders, our bodies on our hips and feet, we require an incredibly fine-tuned “body sense”—a system that learns to anticipate motion based on input from vision, muscles, and, especially, the inner ear. Nausea arises when the brain receives unanticipated sensory inputs—for someone new to boats, say, feeling the ground beneath him pitch up and down, or, for someone in a virtual-reality helmet, seeing oneself move through the world while one’s body knows it is standing still. (Taking the wheel of a vehicle helps, because one can have more control and feel for how one is moving.) To put it simply, motion sickness is really sickness from unfamiliar motion.
But why does unfamiliar motion make us feel so miserable? A leading explanation returns to the notion of nausea and vomiting as something that protects against toxins. During the Pleistocene epoch, when our species evolved, people had no occasion to experience sustained passive motion, as they do today, on a boat or in a car. Much the same sensation can occur with the ingestion of many hallucinatory toxins, however—as anyone who has drunk too much alcohol can attest. So the nausea and vomiting that comes with motion sickness may be a modern by-product of our standard system for expelling poisons and nurturing avoidance of them. This theory is not nearly as well examined as the explanation for pregnancy sickness, however. And we still don’t have a convincing explanation of why anxiety or the sight of blood or of vomit itself should make people sick.
However adaptive nausea and vomiting might be, in cases of hyperemesis like Amy Fitzpatrick’s these reflexes seem to spin out of control. Indeed, prior to the Second World War and the development of modern techniques for replacing fluids, hyperemesis was routinely fatal unless the pregnancy was aborted. Even today, although death is rare, serious injury from the severe vomiting can
occur—including rupture of the esophagus, lung collapse, and tearing of the spleen. No one would suggest that Fitzpatrick’s condition was in the least beneficial. Something had to be done to help her.
Once Fitzpatrick had lost twelve pounds, her doctor prescribed drugs in an effort to control the nausea and vomiting and allow her to eat and drink again. First, the doctor tried Reglan, a drug often used to treat nausea from general anesthesia. Fitzpatrick wore a device that pumped the drug into her leg around the clock. It didn’t seem to help, though; instead, it produced frightening neurological side effects—tremors, lockjaw, body rigidity, and difficulty breathing. The doctor tried a second drug, Compazine, which didn’t do much of anything, and then still another, Phenergan suppositories, which made her drowsy but didn’t slow the vomiting.
All of those drugs work by blocking dopamine receptors in the brain. There is, however, a more recent class of antiemetics on the market today, serotonin-receptor blockers, and these have been hailed as a breakthrough in the treatment of nausea and vomiting. They aren’t cheap—Zofran, the biggest seller, costs a hundred and twenty-five dollars a day or more—but studies show that they substantially reduce vomiting in chemotherapy patients and also in some surgery patients. Nor have any problems with birth defects been detected. So Fitzpatrick was given Zofran by vein for several weeks, but, once again, to no avail.
Her doctor also arranged for blood tests, ultrasounds, and consultations with numerous specialists. Nausea can signify an obstruction of the gastrointestinal tract, or a severe infection, or poisoning. But no alternative cause could be found.
“I know the doctors are trying their best,” Fitzpatrick would say, and she tried her best, too. She just had to hang in there, she told herself, and, ever the M.B.A., she was organized about it. She arranged for a supply of plastic kidney-shaped emesis basins to be stationed at strategic points around the house, and for a suction apparatus with a
plastic nozzle to be kept at her bedside for vacuuming all the sickly saliva from her mouth. For the most part, though, when she wasn’t bent over vomiting, she just lay in bed with her eyes closed.
Meanwhile, a small committee of family and friends systematically gathered information on treatment options, both conventional and otherwise. At various points, Fitzpatrick tried herbal therapy, Chinese massage, and water with lemon in it. She tried ginger after she learned about a study showing that it might be effective for her condition. She tried Sea-Bands, which are acupressure wristbands that apply constant pressure at the “Neiguan point”—a spot on the inside of each forearm situated three finger-widths down from the wrist crease, between the tendons. (Though acupressure has been touted for nausea resulting from pregnancy, chemotherapy, and motion, studies have not revealed any consistent effect.) None of it reduced Fitzpatrick’s nausea, although she did enjoy the massages.
Even more disturbing, the symptoms weren’t getting better with time, as her doctors had expected. By the fourth month of pregnancy, she was as nauseated as she had ever been—an exceedingly unusual occurrence. She looked frighteningly ill. Her weight was down sixteen pounds. Her doctor admitted her to the George Washington University Hospital and had her seen by the high-risk obstetrics service. She was put on intravenous nutrition and she finally started gaining weight. During the next few months, however, she spent more time in the hospital than out.
To her doctors, she was now a spectral, ever-present reminder of failure—the kind of patient whose very existence is a reproach to them and their expertise. Doctors have several ways of dealing with these patients, and in the course of events she must have seen all of them. Some doctors kept telling her that in another week or two she’d turn the corner. One doctor asked if she wanted to go back to New York, and she got the distinct impression that he just wanted to get rid of her. Another seemed to believe that she wasn’t trying hard enough to eat, as if the nausea were under her control. Their frustration was palpable. Later, they suggested that she see a psychiatrist.
This was not an unreasonable suggestion. Anxiety and stress can influence nausea, and she was willing to try anything that might help. But Fitzpatrick says that the psychiatrist who saw her kept focusing on whether she was angry at the babies and unable to accept her roles as wife and mother. A surprising number of doctors still believe in the discredited Freudian theory that hyperemesis is due to an unconscious rejection of pregnancy.
The situation had moved beyond the doctors’ control and, worse, their understanding. Naturally, Fitzpatrick sought to gain a measure of control herself. At one point, she and her family pushed her team to try a treatment they had come across in an article about Maria Shriver’s experience with hyperemesis. The treatment involved a continuous infusion of droperidol, a tranquilizer that is often used to reduce nausea and vomiting in surgery patients. The doctors agreed to try it. During the infusion, however, Fitzpatrick’s condition actually worsened. She started throwing up every ten minutes, developed small tears in her esophagus, and began bringing up blood by the cupful.
Her suffering was bottomless. It is not uncommon in hyperemesis cases for women to abort the pregnancy because of the unrelieved misery. A woman across the hall from her did abort because of hyperemesis, and the doctors proposed the same option for Fitzpatrick. She did not consider it, partly because she was an observant Catholic and partly because each day the nurse came by with a small ultrasound device that allowed her to hear the two tiny hearts fluttering inside her womb. Somehow, that was enough to keep her going.
There is no universal antiemetic. Skin patches containing the drug scopolamine reduce motion sickness and postoperative vomiting but seem to do little for pregnant women or chemotherapy patients. The dopamine-receptor antagonist Phenergan works well for many pregnant women and motion-sickness sufferers but not for chemotherapy patients. Even a cutting-edge drug like Zofran, which is often seen as a kind of penicillin for nausea, frequently doesn’t
help. While Zofran can be highly effective against vomiting from chemotherapy and anesthesia, studies show that it doesn’t help with motion sickness or hyperemesis of pregnancy. (Smoking marijuana, by the way, appears to be effective for chemotherapy patients, if only weakly, but in pregnancy it is as toxic for the fetus as tobacco is.)