Bald spot that grew out after 2 weeks. now hair started thinning all over for many years and still is. short hair are coming in but fall when 2 inches?

Telogen Effluvium: In a person with telogen effluvium, some body change or shock pushes more hairs into the telogen phase. Typically in this condition, about 30% of the hairs stop growing and go into the resting phase before falling out. So if you have telogen effluvium, you may lose an average of 300 hairs a day instead of 100. B12 shots once a month helps this condition.