What other diseases have some symptoms similar to CFS?

Before the diagnosis of CFS can be arrived at, other conditions which can have similar symptoms to CFS must be excluded. These include cancer, HIV disease, autoimmune diseases, neuromuscular diseases, endocrine diseases, and a range of psychiatric illnesses, to name some. The early stages of multiple sclerosis and systemic lupus erythematosus can resemble CFS, and must be carefully excluded.