If you have tight shoulders it is due to the buildup of acidic waste. Tight shoulders due to lymphatic system congestion. The major lymph vessels are on either side of the neck under the clavicle bones. When they become congested and cannot clean detoxification becomes impeded, allowing acidic cellular waste to build in the muscles your shoulders and neck, creating tightness and pain. Activating the lymphatic system with either a session with a lymphatic therapist or learning to activate your lymph with self-lymphatic drainage can help you gain more control over your tight shoulders.