Emerald Essence CBD The type of pain is normally split in to different categories. Neck pain, lower pain, upper pain and tailbone pain. These can also effect down in to the leg and foot causing tingling and numbness. It is also split in to categories based on the duration. Less than 4 weeks is classed as 'Acute'. 4-12 weeks is classed as 'Subacute' and greater than 12 weeks is classed as 'Chronic'. It goes without saying that it can be very frustrating not knowing the best method to relieve the pain.