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 And many people with coeliac disease are asymptomatic, that is, they have no symptoms at all. The following symptoms may occur singularly or in combination. If you are suffering from any of them, talk to your GP. Make sure you include the full range of your symptoms, so that they can consider whether to test for things such as infectious diarrhoea and whether investigations are needed for several different bowel diseases.

Most common symptoms in adults

Diarrhoea
Fatigue, weakness and lethargy
Anaemia
Weight loss (although some even gain weight)
Constipation
Flatulence and abdominal distension
Nausea and vomiting
Cramping and bloating

Less common symptoms in adults:

Easy skin bruising
Mouth ulcers and/or swelling of mouth and tongue
Miscarriages and infertility
Low calcium levels 
Vitamin and mineral deficiencies
Skin rashes such as dermatitis herpetiformis
Bone and joint pains
Dental defects
Altered mental alertness

Common symptoms in children:

Abdominal distension, pain and flatulence
Nausea and vomiting
Diarrhoea or constipation
Large, bulky, foul stools
Poor weight gain or weight loss in older children
Delayed growth or puberty
Anaemia
Tiredness
Irritability

Source: The Coeliac Society of Australia