It is best not to eat crab when you have a cold or cough. Coughs caused by colds are usually related to cold, or viral infections, excessive dampness and heat in the body, and excessive cold and dampness. A reasonable diet should be light, not to eat high-calorie, high-protein and cold, hard food. Crab is a cold food, so eating it can aggravate the symptoms of cough or is not conducive to the improvement of the cold. As coughing is an upper lung qi rebellion, it can easily lead to indigestion, and eating crab can cause diarrhea, abdominal distension, regurgitation and vomiting. A cold is an infection of the upper respiratory tract, often combined with fever due to a sore, congested and edematous throat, so you need to drink more water to ensure that your body is well hydrated. When you have a cold, your resistance decreases and you are prone to allergies when your resistance decreases, so try not to eat seafood.