Chronic Lyme Disease: A syndrome of pain, fatigue, and cognitive symptoms that continue after several weeks of treatment for documented acute Lyme.
Status: The subject of medical debate with two camps arguing over whether it is infectious or post-infectious.
Multiple Chemical Sensitivity Syndrome: Low levels of exposure to chemicals like gas, perfume, and smoke cause symptoms, including extreme fatigue, burning eyes, wheezing, breathlessness, muscle and joint pain, and poor concentration. It's also known as idiopathic Environmental Intolerance.
Status: Hotly debated.
Gulf War Syndrome: After troops returned from the Gulf War in 1991, many veterans complained of fatigue, joint and muscle aches, cognitive problems, headaches, and respiratory difficulties.
Status: Still under debate; some speculate it may be related to MCSS.
