HELLO, THIS IS A CONITION WHEN TENDONOF BACK FOOT IS INFLAMED DUE TO SWELLING IN SHEATH OF TENDON. ACH MEANS PAIN IE PAIN IN TENDON IS TENDO ACHILLES. CAUSE MAY BE ANY FAST WALK, FOOT IN IMPROPER POSITION DUE TO ANY HARD OBJECT UNDER FOOT. CAN SLIGHTLY INJURED THE SEATH THAT INFLAMED. ADVISE REST, HOT FOAMENTATION  TWO TIMES A DAY. ANKLET TO WEAR DURING WORKING HOURS AND DURING REST OPEN IT. PHYSIOTHERAPY. WAX BATH BY PHYSIOTHERAPIST. TREATMENT TABLET FLEXON MR TWO-TIMES A DAY AFTER LUNCH AND DINNER FOR TEN DAYS. VOLINI GEL OR SPRAY TWO THREE TIMES A DAY LOCALLY. IT WILL TAKE TIME TO DISAPPEAR. MORE YOU REST, BETTER IS THE RESULT. I HOPE THIS HELPS YOU. O.K BYE.