Disk bulge can cause this tilt. Consult with physio and learn about posture, precautions and exercises.

Your bulged diac can be aligned to it's normal place with manual therapy.

Visit physiotherapy centre. Posture corrections must.

It is due to muscle spasm and weakness

Disc slip does not cause this if you do regular exercise and follow the advice given to you

It might be due to muscle spasm or Improper posture

1)it's postural tendency correct your posture while sitting, and standing ... While sleeping ..  .take proper semi rigid(not hard or soft) bed for support to spine 2)stand erect while sitting take your weight on both feet keep the both knees in 90 degree ...support your arm on chair arm rest ... 3) take the rest inbetween while prolonged sitting and standing....stretch your back by touching your fingers to....toe.. while keeping knee straight touching figures properly   will gradually improve... 4)if it's pain hot water fomentation...is applied ...if it's spasm ...visit to orthopaedic and do the medicine for muscle relaxation ........ 5)last but not the least a)suryanamskar exercise to strengthen back muscles .... b)Abdominal muscles crunches...20 times each..                                                                                       c)keep the habit of correcting posture in front of full length mirror(dressing table)...

It's may be due to posture dysfunctional or muscles weakness.

Hi. You need posture assessment from a proper physiotherapist and posture correction treatment for same.