Signs of vitamin deficiency include fatigue, weak bones, hair loss, muscle cramps, and slow wound healing. The specific symptoms depend on which vitamin your body is lacking.
This article covers the most common deficiencies, their warning signs, and when to see a doctor.
Most Common Vitamin Deficiencies and Their Signs
Vitamin D Deficiency
This is one of the most widespread deficiencies in the U.S. The NIH estimates that about 42% of American adults are deficient. Signs include:
- Bone pain or weakness
- Fatigue and low energy
- Frequent illness or infections
- Depression or low mood
Low Vitamin D is also linked to poor bone density. Our team supports patients through osteoporosis prevention and management in Lisle.
Vitamin B12 Deficiency
B12 is critical for nerves and red blood cells. Without enough, you may feel:
- Extreme tiredness
- Tingling or numbness in hands and feet
- Memory problems or brain fog
- Pale or yellowed skin
The CDC notes B12 deficiency is especially common in older adults and people on plant-based diets.
Iron and Vitamin C
Low iron causes anemia, leaving you tired, pale, and short of breath. Vitamin C helps your body absorb iron, so a deficiency in either can create a chain reaction.
Quick Reference: Deficiency Signs at a Glance
| Vitamin | Key Warning Signs |
| Vitamin D | Bone pain, fatigue, low mood |
| Vitamin B12 | Tingling, brain fog, pale skin |
| Iron | Tiredness, shortness of breath |
| Vitamin C | Slow healing, bleeding gums |
| Magnesium | Muscle cramps, poor sleep |
When Should You Get Tested?
Don’t Guess — Test
Symptoms of vitamin deficiency overlap with many other conditions. The only way to know for sure is a blood test. An annual physical in Lisle is a great time to check your levels.
Harvard Health recommends testing for Vitamin D and B12 if you feel persistently fatigued, especially if diet or sun exposure is limited.
Final Thoughts
Vitamin deficiencies are common, easy to miss, and simple to address once identified. Don’t brush off ongoing fatigue, aches, or mood changes as “just getting older.”
A quick blood test can tell you a lot. Contact our team in Lisle to get tested and start feeling better.