A new review of Achilles tendon research identified several factors that lead to injury:

  1. Prior injury
  2. Use of (quinolone) antibiotics
  3. Moderate alcohol use
  4. Training during cold weather

Source: van der Vlist AC, Breda SJ, Oei EHG, Verhaar JAN, de Vos RJ. Clinical risk factors for Achilles tendinopathy: a systematic review. Br J Sports Med. 2019 Feb 4. pii: bjsports-2018-099991. doi: 10.1136/bjsports-2018-099991. [Epub ahead of print] Review. PubMed PMID: 30718234.