What might indicate a vitamin deficiency?

Vitamin deficiencies can manifest through a variety of symptoms, and one such constellation includes headache, nausea, and loss of hair. These symptoms can be indicative of several vitamin deficiencies. For instance, deficiencies in certain B vitamins, such as B12 or B6, can lead to neurological symptoms like headaches. Nausea can also arise from deficiencies, particularly if they cause metabolic disturbances. Additionally, loss of hair is associated with deficiencies in several vitamins and minerals, including vitamin D, vitamin E, and biotin. Therefore, the combination of these symptoms strongly suggests the presence of a vitamin deficiency, making this the correct choice.

In contrast, heavy metal accumulation typically presents with a different set of symptoms related to toxicity, not vitamin deficiency. Increased energy levels and improved immune function would generally be signs of good nutritional status rather than deficiency.