The opposite of a high level of health is a low level of health. Poor health can result from a variety of causes, including poor lifestyle choices, illness, and environmental factors. Other antonyms for the word "level of health" could include "deterioration," "decline," or "worsening." Conversely, the synonyms for "level of health" might include "vitality," "well-being," "fitness," or "robustness." Maintaining a high level of health requires attention to various aspects of one's daily habits, including exercise, diet, rest, and hygiene. In contrast, neglect or poor choices in any of these areas can result in a low level of health.