Hair loss

Hello .myvdaughter had both sides if her thyroid removed 5 years ago with radioactive treatment to follow. She also has had several malignant melanomas removed and now has a heart condition. The Drs often have to re regulate her thyroid meds after her regular tests.

Her problem at the moment is she regularly loses clumps of hair at the back and her hair is thin in places. Does anyone recommend any hair treatment which would help her. She's 47.