Hot Weather = More Hair Growth?

Hi Dr. Rassman.

I was wondering if you knew why hair seems to grow longer/faster in the Summer time. I don’t know if this has ever been scientifically proven, but I have always noticed this with myself and my hair dresser says she notices it all the time with her clients. I assume it has something to do with the warm whether.

If this is true, do you think heat/body temperature would have any affect on the way finasteride behaves?

Hair growing faster/longer in the summer isn’t a proven fact, but if it is something you notice I can’t dispute it. I’ve read all kinds of theories about why hair might grow faster in the summer (if so, likely due to hormones), but some people believe that hair actually sheds at a higher rate in the summer compared to the winter. Unfortunately, there is no good science on this subject. Maybe it is from a subjective perspective.

There is also no correlation that I am aware of with respect to body heat and finasteride. For that matter, humans are warm blooded and our body heat stays right around 98.6 degrees Fahrenheit (37 degrees Celcius for those outside the US), perhaps fluctuating only around a degree F.