The common nutritional characteristic of seafood and fish is high protein. The possible reason why doctors say to certain patients that they cannot eat seafood is that the patient is in an allergic state, allergic to seafood, and eating fish may also cause allergy. In addition, it is also possible that the patient may need to limit protein intake recently, or may be hyperuricemia, gout, restrict high purine foods, should avoid the intake of high-protein foods and irritating foods, or due to taking certain drugs during the consumption of seafood and fish may increase the occurrence of certain side effects, etc., so you should follow medical advice to avoid such foods. If the patient is allergic, he or she can seek medical advice to identify the allergen and clarify whether freshwater fish can be consumed. If fish cannot be consumed, lean meat, eggs and soy products can be consumed instead of fish to supplement the body’s nutritional needs. If the patient is under treatment, he should follow the doctor’s advice to take medication and follow the doctor’s advice to eat a light diet, eat fresh fruits and vegetables rich in vitamins, reduce the intake of high-protein food, and avoid greasy and spicy food, so as not to increase the burden of digestion in the gastrointestinal tract. In addition, if you have already eaten fish, you should avoid eating it again and drink more water to promote body metabolism. You should also pay attention to your own condition and seek medical attention if you experience gastrointestinal discomfort, local redness, swelling, pain, rash and itching.