Common symptoms are:
(a) difficulties hearing conversations, radio or television when there is background noise.
(b) whistling, whooshing, ringing and buzzing noises in the ears (tinnitus).
In the mildest form it may be infrequent. However, it can be constantly present and can lead to clinical depression.
Industries where excessive noise is common include
the textile trade (eg weaving sheds such as Cautaulds)
large scale bakeries (Harvestime and Mapleleaf)
building trade (drills, cutting tools, pneumatic tools)
highways maintenance (pneumatic tools)