Hair thinning or excessive hair loss may be another clue. Although hair loss can have many causes, research suggests severe vitamin D deficiency may affect hair follicle health in some individuals. Slow wound healing is another possible symptom because vitamin D contributes to skin repair and inflammation control.
Some people also experience excessive sweating, particularly around the head. This unusual symptom has long been associated with low vitamin D levels in both adults and children. Muscle cramps, tingling sensations, and poor balance may also occur as deficiency worsens.
Doctors are especially concerned about deficiency in older adults because low vitamin D levels may contribute to osteoporosis and increased fall risks. Children who lack sufficient vitamin D may develop weak bones and growth problems.
Several factors can increase deficiency risk, including spending little time outdoors, using strong sunscreen constantly, obesity, aging, darker skin tone, and digestive disorders that reduce nutrient absorption. People living in areas with limited sunlight may also face greater risk during colder months.
