Other causes include:

• The most common cause of Achilles tendonitis is an overuse injury of the Achilles tendons, repetitive stress due to excessive exercise, walking or sports activities.
• Suddenly increasing the intensity of exercise without a proper warm-up
• Playing sports that require swift or rapid movements
• Not taking enough time to increase training
• Wearing ill-fitting footwear and using the wrong equipment
• Using high heels for prolonged period
• Running on uneven surfaces
• Risk factors include:
• Sex - Men are more prone
• Age - people above 50 years of age are at higher risk
• People with a naturally flat feet are at high risk
• Obesity
• Tight calf muscles
• Bone spurs in the back of the heel
• Running in worn-out shoes
• Taking antibiotics called fluoroquinolones
• Psoriasis
• Hypertension

If untreated, tendonitis can result in rupture of the Achilles tendon