What could be causing hair loss in my home? Me my mom and sister have lived in the same house for 15 years. Two years ago we noticed gradual hair loss and thought it was no big deal. However, our hair loss still continues and I can notice my hair is much more thin. Hair loss does not run in our family and I believe the problem might be environmental. The fact that we all started loosing hair around the same time doesn't really point to genetic hair loss.