The sudden growth of hand hair may be due to external factors or disease. If it is caused by external factors, it is not a disease and can be relieved by itself. If it is caused by disease factors, then it is a disease, to go to the hospital to do the relevant examination, according to the results of the examination to make a judgment. 1. External factors: if contact with some exogenous substances, such as chemicals or allergic substances, and lead to endocrine disruption, this situation will cause the hand hair suddenly become long, this is not a disease, through timely adjustment can be relieved. 2. Disease factors: if the body due to excessive secretion of sex hormones or adrenal gland abnormalities and lead to adrenal cortical hyperplasia, can also lead to the phenomenon of sudden growth of hand hair, this is a disease, it is recommended to go to the hospital in time to do the relevant diagnosis and treatment. Hand hair suddenly long phenomenon, it is recommended to go to the hospital for timely examination, targeted treatment, do not blindly deal with their own.