How can I tell if I'm lactose intolerant?

Lactose intolerance? Lactose breath testing (objective) or a clinical response to lactase enzyme supplements &/or milk avoidance (subjective decline in the gassiness & diarrhea associated with ingesting lactose) may clarify your concern. Some (particularly children) with suspected lactose intolerance however are intolerance to other milk components. Bleeding, weight loss, significant tenderness is not lactose intol.

Related Questions

Apart from going to the doctor - how can I tell if I'm lactose intolerant?

Trial and error. Eat lactose contaning foods with and without lactaid pills. If no GI upset with the pills, then you might be lactose intolerant. Read more...
Self-check. Drink milk--a glass 3-6 times over day. If you get GI upset, lower GI distress (cramps/gas), note this. Then do your best to do without dairy for 3-5 days. If symptoms disappear, is your likely answer--can always "rechallenge" by drinking milk again after a quiet period to see if it brings symptoms right back or not. Read more...