Drowsiness after meals may be a normal physiological phenomenon, or it may be caused by anemia, thyroid disease and other diseases. 1. Normal physiological phenomenon: after eating a meal, the gastrointestinal tract will begin to digest the food, this process requires a large amount of blood to participate in, so it may cause a relative lack of blood supply to the brain. When the blood supply to the brain is insufficient, some uncomfortable symptoms will appear, such as sleepiness, drowsiness, yawning and so on. 2. Anemia: If the patient is anemic, he or she will often feel very tired and pale, and usually have the symptoms of sleepiness, dozing and lack of energy, and the symptoms may be more obvious after meals. 3. Thyroid disease: If there are problems with the thyroid gland, such as hypothyroidism, then the patient may also appear to speak slowly, can’t get excited about anything, slow reaction, sleepy and so on. If the patient is often sleepy after meals and has other uncomfortable symptoms, it is recommended to consult a doctor in time to clarify the cause of the disease and carry out appropriate treatment.