Overactive salivary glands produce too much saliva in the mouth, according to WebMD. Salivary glands normally become overactive when a person eats very spicy foods.

Some of the treatment options available for an overactive bladder include pelvic floor muscle exercises, losing weight, medications and surgery. Visiting a doctor and listening carefully to instructions is key to finding a solution for this condition, notes WebMD.

An overactive immune system, which is the source of autoimmune disease, is affected by sex hormones, according to a 2004 article by Vicki Brower in EMBO Reports. For instance, estrogen predisposes women to systemic lupus erythematosus. Infectious disease may also play a causal role, as immune cells

Possible causes of an overactive thyroid, or hyperthyroidism, include Graves' disease, thyroiditis, a thyroid nodule or too much iodine levels in the body, according to WebMD. Taking excessive thyroid hormone medications can also lead to the disorder.

Some of the most common symptoms of an overactive thyroid, also known as hyperthyroidism, include thyroid enlargement, anxiety, nervousness, hair changes and difficulty sleeping, according to WebMD. Symptoms often mimic other illnesses, and people with mild forms of the condition may not notice any

Trospium, tolterodine, solifenacin, oxybutynin, mirebegron and darifenacin are used to treat an overactive bladder, according to Mayo Clinic. These drugs relax the bladder, relieving urinary urgency and helping people with overactive bladder to avoid leakage.

Exercises that help with overactive bladder include Kegel exercises, bladder training and use of vaginal cones in women, according to Healthline. Individuals can strengthen pelvic floor muscles and the bladder by performing other exercises such as walking or jogging, tennis, swimming.

An overactive thyroid can cause male breast growth, according to Healthline. Other symptoms that are not gender specific include weight loss, hair loss, rapid heart rate, an enlarged neck and frequent bowel movements. Patients may feel nervous or restless, have hand tremors, experience higher blood

Some treatments for overactive bladder include behavioral interventions, medications and bladder injections, according to Mayo Clinic. Other treatments include nerve stimulation and surgery.

Individuals with overactive bladder syndrome experience an involuntary loss of urine accompanied by sudden urges to urinate, urinate more than eight times within a 24-hour period and have difficulty controlling urges to urinate, according to Mayo Clinic. Patients with an overactive bladder typically