There’s a type of exhaustion that sleep can’t fix. You wake up still feeling tired, move through the day in a fog, and often blame stress or a hectic schedule. But sometimes, persistent fatigue may have a nutritional cause that’s easy to overlook.

One possible cause is low vitamin B12, which is essential for red blood cell production and oxygen delivery. When B12 levels drop, it can quickly sap your energy, leaving you feeling weak and drained.

Low B12 doesn’t always show up with obvious symptoms. In addition to fatigue, some people may experience tingling or a “pins and needles” sensation in their hands and feet. This happens because B12 is crucial for nerve health.

Changes in appearance can also signal a deficiency. People may look paler than usual or develop a subtle yellowish tint to their skin. These shifts can be easy to miss at first, but they are worth noting.

Since B12 supports brain function, low levels can impact mood and focus. You might feel forgetful, distracted, irritable, or mentally foggy. While stress can cause similar effects, a nutrient deficiency can be a contributing factor as well.

Other symptoms may include shortness of breath, light-headedness, or a sore tongue. In more severe cases, balance and coordination may become slightly impaired, signaling the body’s need for attention. Deficiency can occur for various reasons, including poor dietary intake or absorption issues. Older adults, vegetarians, and people with certain digestive conditions may be at higher risk. If you notice several symptoms, a healthcare professional can help by running a blood test and offering guidance on diet or supplements to restore your energy.