18 yr old fem. 1st day of period, severe cramps+lower back ache. This is usual. But quadriceps hurt on the 1st day for the past year or so. Normal?

Painful periods. There are multiple options. Hormonal treatments such as birth control pills, Progesterone treatments and the Mirena (levonorgestrel) iud are effective reversible treatments that will help many people. There is also a drug called Lysteda that contains no hormones which will help others. It is not clear why you would be having pain in your leg. Schedule a visit for evaluation.