The discomfort of a concave navel may be caused by intestinal discomfort, obesity or abdominal inflammation, gastritis or stomach cramps, or inflammatory infections at the navel. 1. Intestinal discomfort: the most common cause of belly button discomfort is intestinal discomfort, improper diet or cold is a common cause, the longer the time, the slower the recovery. You should consult a doctor for a reasonable diagnosis and treatment, to avoid recurrence or aggravation, and at the same time a reasonable diet, to light and easy to digest, avoid cold, greasy and spicy, etc., adjust the mentality, and develop a good daily routine, to promote the recovery. 2. Obesity or abdominal inflammation: navel sunken inward to enhance the body’s physical fitness, navel sunken is navel shallow small, because of obesity or adhesive tuberculosis peritonitis, at this time, the examination will find that the navel will be inwardly sunken. 3. gastritis or stomach cramps: navel inward concave uncomfortable mainly are not well-digested food or inflammation caused by gastritis with stomach cramps, it is best to timely medication observation. This situation can be taken orally four mill soup oral solution treatment, avoid eating cold and hard food, adjust the diet are conducive to improve, or hospital treatment. 4. Inflammatory infections: If the navel has sebaceous cysts combined with infections, or folliculitis and other inflammatory infections, there will also be navel will be sunken inward. It is recommended to consult a doctor in a timely manner, after the cause is clear targeted treatment, do not be negligent, so as not to delay the condition.