Persistent weakness despite adequate rest can be caused by various medical conditions such as diabetes, thyroid disorders, vitamin deficiencies, anemia, and sleep apnea. These conditions affect energy levels, leading to fatigue and weakness. Chronic Fatigue Syndrome can also be a factor, especially after viral infections like dengue or COVID, but it is treatable with medical help. Persistent weakness despite adequate rest can be caused by various medical conditions such as diabetes, thyroid disorders, vitamin deficiencies, anemia, and sleep apnea. These conditions affect energy levels, leading to fatigue and weakness. Chronic Fatigue Syndrome can also be a factor, especially after viral infections like dengue or COVID, but it is treatable with medical help. Health and Fitness, Health Tips, Exercises & Workout Tips, Diet & Wellness | Times of India Lifestyle