Feeling stressed? You're not alone. Most Americans are living with moderate to high levels of stress — and it can take a serious toll on one's health. On a daily basis, stress can cause headaches, muscle pain, fatigue and irritability. Long-term, it can weaken your immune system and raise your blood pressure and cholesterol levels. Learning to manage stress is one step toward living a healthier life. Wondering where to start? Try these 10 easy ways to instantly reduce stress.