Stress is not “just” a feeling. It is a full-body biological reaction — one that influences every major system in the body when it becomes long-term. Sleep, digestion, hormones, immunity, energy, and mood are all shaped by how the body responds to ongoing stress.

Your nervous system works quietly in the background every moment of your life. It regulates your heartbeat, breathing, digestion, hormones, and emotional reactions. Most people never think about it until it becomes overwhelming. And when it does, the entire body reacts.