Hello, the answer is probably no but I ll tell you more in the next paragraph. Yaz may rarely cause such symptoms though. You should discuss this issue with your doctor and perhaps also with an endocrinologist. Sweating and weight gain are general symptoms occurring in a multitude of disorders but an increase in body hair is almost always due to either a side effect of a medication or a hormonal disorder. Let me get back to metformin now. I suppose you re female - because you re worried about the hair - although you haven t mentioned your sex. Women with PCOS (polycystic ovary syndrome) may have problems with increased hair (with male pattern of distribution) due to increased insulin levels causing increased androgen levels. Metformin may reduce insulin levels and -consequently- androgen levels and may help with hirsutism (increased hair). Stopping metformin may make the hormonal disorder recur and increase the hair. I hope I ve answered your question. Please let me know if you need further assistance. Kind Regards, Dr Panagiotis Zografakis, Internal Medicine Specialist