I had a lumpectomy, chemo and radiation for stage 1 breast cancer. 4 lymph nodes were removed and found negative. I am 1 year out and have no lymphedema. Am I able to go into a hot tub or sauna and if so, should I limit the amount of time?

A hot tub may. cause some serious skin changes in the radiated area. Radiated tissue becomes hypo-vascular ( much less blood flow) and prone to injury much more so than non radiated tissue. I would recommend against a hot tub. But that is just my opinion.