What general symptom is common across all vitamin deficiencies discussed here?

Weakness is a common symptom associated with various vitamin deficiencies due to the critical roles that vitamins play in many bodily functions, including energy metabolism, red blood cell production, and overall cellular health. For instance, deficiencies in vitamins such as B12, B6, and certain others can lead to fatigue and muscle weakness as the body lacks the necessary nutrients for optimal energy production and muscle function. In addition, vitamin D deficiency can also contribute to muscle weakness, particularly in older adults. This symptom reflects the general impact of vitamin deficiencies on the body's overall vitality and can affect anyone regardless of the specific vitamin lacking. Other choices such as severe weight gain, high blood pressure, and excessive sweating do not consistently link to vitamin deficiencies, making weakness a more relevant and inclusive choice across various deficiencies.