Your doctor will try to achieve a balance between controlling your symptoms while minimizing toxic effects from treatment.

CNN: Recurrent breast cancer

Dr. Sarah Janssen, a physician and scientist for the Natural Resources Defense Council, an environmental advocacy group, says that she frequently sees patients complaining of symptoms related to toxic levels of mold, lead, formaldehyde and tobacco smoke.

FORBES: Hidden Household Toxins

The symptoms of pre-eclampsia have been linked to the production of toxic molecules called free radicals by the placenta.

BBC: Vitamins 'could prevent pregnancy danger'