Surely it may be due to heavyweight lifting as u r saying...now try to take rest and least movement of that part...it happens and it may resolve with these simple steps...pain me remains for around 2 days dont take pain killer or something it will give temporary relief pain will reduce if u gave rest to them...
Next Steps
Take Lakdhaadi guggul tablet 2 three times a day...
And most important thing Take Mahanarayan Taila its an ayurvedic taila having very good results...
Do massage with smooth hands dont give more pressure...after massaage give hot fomentation over there...
U will definately feels good...
Health Tips
Imp thing is gave rest to that part dont do weightlifting or any exercise....