Chronic Fatigue: Persistent tiredness that doesn't improve with rest can be a sign of vitamin D deficiency.
Bone Pain: Vitamin D is essential for calcium absorption, and without enough vitamin D, bones can become thin, brittle, or misshapen
Muscle Weakness or Pain: This can be a subtle or severe sign, not necessarily linked to any physical exertion.
Mood Changes, Including Depression: Vitamin D receptors are present in many parts of the brain, and low levels of vitamin D have been associated with an increased risk of depression.
Impaired Wound Healing: Slow healing of wounds after surgery or injury may be a sign of low vitamin D levels
Bone Loss: Vitamin D is vital for bone metabolism and calcium absorption. Low bone mineral density can indicate a deficiency in vitamin D.
Hair Loss: While hair loss can be due to many reasons, vitamin D deficiency has been linked to alopecia areata and may be associated with severe hair loss.
Getting Sick Often: One of vitamin D's most critical roles is keeping your immune system strong so you're able to fight off viruses and bacteria that cause illness.
Muscle Cramps: The precise mechanism is unclear, but muscle cramps and spasms can be a symptom of vitamin D deficiency, possibly due to its role in calcium regulation and muscle health.
Increased Sweating: An inexplicably sweaty forehead, even when you're not exerting yourself, can be an early sign of vitamin D deficiency.