Generally speaking, it is okay to eat crab when you have a cold. Crab contains rich nutrients that can enhance one's physique, improve immunity, and strengthen the body's ability to resist viruses. However, it is important to control the amount consumed. Crabs, being aquatic animals, are quite cold in nature. During a cold, the body's constitution is relatively weak, and the gastrointestinal function is not very good. Eating too much crab can increase the burden on the gastrointestinal tract, which is not conducive to the recovery from a cold. During a cold, it is advisable to eat some light fruits and vegetables.