Belly button left 3~5 cm pain also keep farting possible causes are acute colitis, ulcerative colitis, colon cancer, etc., treatment with drugs, surgical treatment and so on. 1. Acute colitis: when patients are infected with bacteria such as typhoid bacillus and campylobacter leading to acute colitis, it can lead to 3~5cm pain on the left side of the navel, and the bacterial imbalance caused by inflammation stimulation can make patients fart all the time. Can take drugs such as cefixime, quinolone and other treatment. 2. Ulcerative colitis: patients with ulcerative colitis, often occurring in the sigmoid colon, rectum, so often appear on the left side of the abdominal pain, intestinal flora imbalance, so it can be manifested as the left side of the navel 3~5 cm of pain and farting all the time, which can be treated with medication such as aminosalicylic acid, glucocorticosteroids, etc., and also surgical treatment, such as sigmoidectomy and so on. 3. Colon cancer: when the lesion of colon cancer patients is in the left half of colon, the clinical manifestations such as 3~5 cm pain to the left of navel and farting all the time can be seen, and the treatment mainly includes surgical treatment such as radical surgery for colon cancer. When the patient has 3~5cm pain on the left side of the navel and keeps farting, he should go to the hospital in time for further examination and treatment under the guidance of professional doctors. Drugs need to be used under the guidance of a professional physician, and should not be used arbitrarily on their own.