Is it possibly to have hirsutism/excessive hair growth but not have pcos?

Absolutely : Pcos is the most common cause of hirsutism, but androgens are also secreted by the adrenal gland. A block in the metabolic cascade of these hormones can cause androgen elevation. Cushing's syndrome can also cause hirsutism. Some medications can cause hirsutism. There are also androgen-secreting tumors which can cause hirsutism. Occasionally no cause can be identified.