In general light therapy is safe. Side effects have been minimal. While a small minority of patients report headaches, eyestrain or eye irritation or nausea when they begin treatment, but these effects usually are mild and disappear after a few days. Individuals whose skin is especially sensitive to light, such as those with lupus (systemic lupus erythematosus) should consult a physician before attempting light therapy for any condition. You may be advised to avoid light therapy if you have a history of skin cancer or if your eyes/ skin are sensitive to sun light.