[stav]

my chicken was sick for a few days, i tried antibiotics but nothing worked, next day i found it dead but i noticed that its lower neck was ballooned does anyone know why ??

[rachelr]

I am so sorry did you take her to the vets?

By lower neck do you mean her crop. If so she might have not been able to empty it or something and it had gone septic. If you check the birds regularly this bulge should go up and down as he crop is digested.

other people will be along with more help I am sure

[joyfull]

it could be sour crop if squidgy or sometimes they can get air trapped under the skin which needs lancing (you do need to be shown how to do this) to release the air build up.
When she was unwell did you take her to a vets to get the antibiotics? If so what was their diagnosis?