In the short-term, stress can lead to physical issues such as headaches, stomachaches, chest pains, and a weakened immune system. Long-term stress can have more serious effects, including an increased risk of heart disease, depression, and anxiety. Stress can also cause changes in behavior, such as sleeping too much or too little, overeating, or relying on drugs or alcohol to cope. In addition, chronic stress can cause cognitive problems, such as difficulty concentrating or making decisions. It can also cause emotional issues, such as mood swings, feeling overwhelmed, and feeling disconnected from friends or family. Ultimately, if left untreated, stress can have detrimental effects on your physical and mental health.