Ongoing tiredness is one of the earliest and most common signs associated with vitamin B12 deficiency. A person may feel exhausted even after sleeping or may notice that ordinary daily activities require more effort than before.
This fatigue may develop when the body is unable to produce enough healthy red blood cells. Red blood cells are responsible for transporting oxygen throughout the body, including to the muscles, organs, and brain.
When oxygen is not carried as efficiently, energy levels may fall. Tasks that were previously manageable may begin to feel unusually demanding, and the person may need more frequent breaks.
The tiredness connected with low vitamin B12 can easily be blamed on work, family responsibilities, stress, or poor sleep. While those factors can also cause fatigue, persistent exhaustion that does not improve deserves attention.
Some people may also notice a general loss of stamina. Walking, climbing stairs, exercising, or completing household tasks may become more difficult than expected.
Weakness, Dizziness, and Shortness of Breath
