Symptoms of low testosterone levels in men include depression, fatigue, weakness and the loss of sex drive, according to WebMD. Testosterone levels usually begin to decline after age 30. Low testosterone levels cause the... More »

Low testosterone can affect men by decreasing sexual function, causing physical changes, increasing sleep disturbances or causing emotional changes, according to Mayo Clinic. The effects vary from case to case and, in so... More » Health Conditions & Diseases

Low testosterone is any measurement that falls below 300 nanograms per deciliter, according to Healthline. The condition occurs gradually as men enter old age and results in a decreased libido, hair loss, depression, wei... More » Health Medical Ranges & Levels

Possible side effects of low levels of vitamin D include muscle and joint pain or weakness, bone pain, fatigue and depression. Vitamin D deficiency does not often produce noticeable symptoms, so most people are not aware... More »

Symptoms of androgen or testosterone decline in men, sometimes colloquially referred to as male menopause, include depression, weakness and fatigue, according to WebMD. Loss of interest in sex, decreased libido, subtle c... More »

The most common side effects of vitamin D include fatigue, weakness, dry mouth or a metallic taste in the mouth, loss of appetite, nausea and vomiting, according to WebMD. Most people do not experience side effects with ... More »

Symptoms of low iron in the blood, or iron-deficiency anemia, include weakness, fatigue, shortness of breath, pale skin and dizziness, according to Healthline. Soreness or swelling of the tongue, a feeling of tingling in... More »