Tryptophan deficiency may cause memory loss, weakness, swelling and other symptoms. If the above symptoms occur, you can not judge by yourself as tryptophan deficiency, whether the specific lack of tryptophan need to go to the hospital for examination, such as diagnosed with tryptophan deficiency, you should consult a doctor in a timely manner, and comply with the doctor’s instructions for treatment, and at the same time under the guidance of the doctor to consume tryptophan-rich foods, such as meat, eggs and milk, etc.. 1. Memory loss: the lack of tryptophan can reduce the synthesis of nerve cells in the human body, thus causing memory loss and difficulty in concentration. 2. Weakness: Due to the damage of nerve cells, it is easy to produce a sense of fatigue, which triggers weakness in the limbs and other discomforts. 3. Swelling: when the body lacks tryptophan, the synthesis of plasma proteins will also be affected, and a serious lack of it can lead to hypoproteinemia, resulting in swelling of the feet, legs and other parts of the body.