Dull discomforts are physical pains that can be caused by a variety of conditions, such as muscle strain, arthritis, or even a simple cold. ACHES is one of the most common forms of dull discomfort, and is usually described as a dull, throbbing pain. It can be localized to one area of the body, or it can be felt throughout the entire body. ACHES can be caused by a variety of factors, including physical activity, stress, and even certain medications.