Compared to most prescription drugs the safety of growth hormone is very good. Signs of too much growth hormone are edema of the feet and hands with carpal tunnel symptoms of numbness of the fingers. Some people think GH replacement may cause a proliferation of cancer cells, this is generally not true. Patients with acromegaly, excessive growth hormone levels actually have a decrease incidence of cancer. This decrease in cancer is thought to be from growth hormone’s ability to stimulate the immune system to fight cancer.