Hair loss upto 100 hair/day is normal. If more than that, then it's abnormal.
Various causes are Telogen effluvium (after stressful events like COVID, surgery, accident, pregnancy),
vitamin deficiency, Anemia, due to Hormones, or alopecia areata.
But they are reversible if treated early and promptly.
Next Steps
consult/chat online with me/any Dermatologist for proper prescription of medicine.
Health Tips
HAIR CARE: use shampoo regularly and dry your hair completely in sunlight after bath. Do not rub your hair while washing/drying hair.
Do not apply oil immediately after taking bath.