Start with hydration, gentle movement, and regular balanced meals. Water, a brief walk, and a protein-forward meal often help. If it’s tied to a viral illness, rest and fluids matter. But if weakness persists beyond weeks or comes with shortness of breath, palpitations, chest pain, fainting, weight loss, or other red flags, seek medical evaluation. Avoid overreliance on caffeine/energy drinks; they can worsen long-term fatigue. Build a routine around sleep consistency, walking, and protein+fiber meals.