 [ Symptoms ] drug test where to find [ Disease ] lupus may be hard to diagnose it is often mistaken for other diseases for this reason lupus has been called the great imitator  the signs of lupus differ from person to person some people have just a few signs others have more common signs of lupus are red rash or color change on the face often in the shape of a butterfly across the nose and cheeks painful or swollen joints unexplained fever chest pain with deep breathing swollen glands extreme fatigue feeling tired all the time unusual hair loss mainly on the scalp pale or purple fingers or toes from cold or stress sensitivity to the sun low blood count depression trouble thinking andor memory problems other signs are mouth sores unexplained seizures convulsions seeing things hallucinations repeated miscarriages and unexplained kidney problems