Side effects of fenugreek include diarrhea, gas, bloating, upset stomach and a urine odor similar to maple syrup, as listed by WebMD. Fenugreek may also lower blood sugar, and it may cause coughing, wheezing, nasal congestion, facial swelling or a severe allergic reaction if the individual is hypersensitive.
Fenugreek is most likely safe when consumed in the amounts found in foods, according to WebMD. However, there is not enough research to confirm the safety of fenugreek in medicinal doses as of 2015, though it is possibly safe when taken for up to six months. Pregnant women should avoid taking doses of fenugreek greater than those found in food as the substance can cause early contractions. It may also cause the baby to have an unusual body odor for some time. Despite the herb's ability to stimulate breast milk, women who are breast-feeding should avoid fenugreek until additional research confirms its safety.
Children should not take fenugreek as there are some reported cases of unconsciousness linked to the consumption of fenugreek tea. People with diabetes should monitor their blood sugar levels carefully when taking fenugreek due to its ability to lower blood sugar. Individuals who are considering taking fenugreek should first consult a doctor, especially if they have a health condition or are currently taking other medications.