Yellow underarm sweating is an abnormal phenomenon, it is advisable for patients to go to the regular hospital to check first, which may be the manifestation of certain diseases, such as chromhidrosis, liver and gallbladder diseases. 1. Chromhidrosis: a rare skin disease characterized by colored sweat, the symptoms of sweat staining, sweat is usually yellow, but also see blue, green, brown, light red, light green, etc., and can be combined with armpit odor. Color sweat is usually confined to the armpits, but can also be seen in the perineum and groin and other parts. 2. Liver and gallbladder diseases: for example, liver and gallstones, hepatitis, chronic cholecystitis, liver cancer, cirrhosis and other diseases, the patient will have bile stagnation, blockage and liver dysfunction, bilirubin level increases, along with the body’s sweat, resulting in sweat can be yellow. This symptom alone is not enough to diagnose the disease, do not rule out that it is caused by other factors, such as taking drugs. It is recommended that the patient consult a doctor in time to clarify the cause of the disease and give targeted treatment.