Please get it checked out. Much better safe than sorry. I didn't have much change in voice but it isn't as strong/loud as pre-treatment. I recall sitting in a meeting with some unfamiliar faces a few months back and someone in attendance said I was "Too softspoken" and to please speak up. I explained in front of the group that it was challenging for me to carry my voice but I was very happy to be present and able to speak to them at all! I then explained why.....
Hopefully all is normal and your voice is just carrying a "new normal." Speech therapy may be worth exploring as well.
Best Wishes,
Steve

SCC right side BOT/FOM; DX 1-25-06; Neck dissection/25% of tongue removed 2-17-06. Stage 2 Recurrence 7-06: IMRTX35 & 3X Cisplatin ended 10-18-06. Tumor found 03/18/13; Partial Glossectomy 03/28/13 left lateral tongue. Nov. 2014; headaches,lump on left side of throat. Radical Neck Dissection 12-17-14; Tumor into nerves/jugular; Surgery successful, IMRTX30 & 7X Erbotux. Scan 06-03-15; NED! 06-02-16; Mets to left Humerus bone and lesion on lungs-here We go again! Never, Ever Give Up!

**** PASSED AWAY 10/8/16 ****