The left side of the nose pain has skin, mucous membrane and other reasons, specific as follows: 1, skin problems: patients appear left side of the nose with symptoms of pain, often the left side of the nose or nasal vestibule area of the skin local inflammation, swelling, and local skin unclean factors, but also may be with the patient repeatedly digging the nostrils, rubbing the nose, or even pulling the nose hair behavior related to the nasal vestibule as well as the nasal skin boils or infected cysts, leading to pain symptoms. 2, mucous membrane problems: patients may appear left side of the nasal mucous membrane inflammation, congestion, swelling, often accompanied by dry factors, may also cause left side of the nose pain. Infected cysts, resulting in pain symptoms. 2, mucosal problems: patients may experience inflammation, congestion, swelling of the mucous membrane of the left side of the nasal cavity, often accompanied by dryness, which may also cause pain and discomfort in the left side of the nose. For the pain symptoms are more serious, patients often need to use antibiotic drugs to improve the treatment, but also often can be used in conjunction with the use of heat detoxification of Chinese medicines, such as a clear capsule.