Top of head feels sore. it feels like my muscle underneath my scalp flares up every evening. best i can explain. please advise possible causes?

Anxiety?: A very common reason for scalp tenderness without any associated skin changes would be anxiety-induced scalp muscle tightness. This could involve any part of the scalp but often involved the temples, the back of the head, & the neck area. OTC acetaminophen, or OTC NSAID meds like ibuprofen or naproxen, or applying cool compresses can be helpful.