If was diagnosed with pcos polycystic ovarian syndrome, why would I start to develop unwanted facial hair and loss of scalp hair?

Male hormones. Besides weight gain, abnormal ovulation, and multiple cysts on the ovaries elevated male hormones is part of the polycystic ovary syndrome diagnosis. The unwanted hair growth usually facially and on the abdomen and chest and hair loss is due to elevated male hormones.
Too much androgens. With pcos the ovaries produce excess male-type hormones (androgens) like testosterone, which cause unwanted hair growth (face, lower stomach) and sometimes male-pattern hair loss. If not trying to conceive birth control pills are often used to lower androgens, sometimes with antiandrogens like spironolactone as well to decrease hair growth more than bc pills alone. Vaniqa may help on the face only.

Related Questions

Unwanted facial n extra body hair, cystic acne is it a sign of polycystic ovarian syndrome hw 2 prevent n cure?

Yes. PCOS. . Those are the typical symptoms of pcos, plus irregular periods and obesity. See your gyn and endocrinologist for proper diagnosis and treatment. Read more...
Androgen work up . You need to have a hormonal work up which can start with your gyne. Depending on what is found and your overall metabolic status, you may also need an endocrinologist. Read more...