Under normal circumstances, eating crab is not a headache. Chinese medicine considers crab to be a cold food, and those with a cold spleen and stomach may be more likely to suffer from abdominal pain, diarrhea and indigestion after eating crab. Therefore, it is recommended to eat crab with ginger seasoning, which has the effect of warming the stomach and driving away the cold, which can reduce the occurrence of abdominal pain and diarrhea. If the crab is eaten unfresh or bad, it can lead to abdominal pain, diarrhea, gastroenteritis, and may also cause headache problems. There are also many causes of headaches, and when a gastrointestinal cold occurs as a result of an unclean diet, headaches can also manifest themselves. Crab may induce gout when eaten because there are also many purines and nucleotides in crab that tend to produce too much uric acid in the blood, and if the uric acid itself is too high, it may induce a gout attack.