Experts pointed out that for healthy people, eating too much crabs can cause indigestion symptoms such as abdominal distension, while for some people who have diseases themselves, eating crabs will aggravate their illness, so these patients can't eat crabs. The first category is hepatitis patients. The gastric mucosa of patients with hepatitis is prone to hyperemia and abnormal bile secretion. It can be said that the function of the whole digestive system is poor, so it is difficult to digest and absorb protein contained in crabs. Such patients often have symptoms such as abdominal distension and vomiting after eating crabs. The number of people who avoid eating crabs in the second place is patients with cardiovascular disease. Besides being rich in protein, crabs also have high cholesterol. Eating too much cholesterol is tantamount to adding insult to injury to people suffering from cardiovascular and cerebrovascular diseases, ranging from indigestion to stroke and heart attack. Patients with cholecystitis and pancreatitis should also not eat crabs. These two diseases belong to digestive system problems. A large amount of protein in crabs enters the digestive system of these patients, which will undoubtedly increase the burden on their gallbladder and pancreas, have adverse effects on their condition, and even cause an acute attack of the disease. In addition, Chinese medicine also believes that crabs are aquatic animals and belong to "cold nature", so some people with deficiency of spleen and stomach are not easy to absorb after eating. Patients with a cold and fever are not suitable to eat crabs, so as not to aggravate the symptoms. In addition, some patients with allergic history will have allergic reactions after eating crabs because they contain xenogenic protein. Some people have red wheals all over the body after eating crabs, some have long red rashes, itching is unbearable, and severe anaphylactic shock will occur.