This is an excellent site, it lists the health benefits of flaxseed too, the other half list the side effects, which is in part why I suggest coconut oil, (I'm getting there, patience lol, probably the last time you'll ask me haha.)
Flax Seed Side Effects
They say too much of anything isn't good. When it comes to flax seed, some people may experience some health concerns instead of benefits. This is why experts say that it is better to consume flax seed in small quantities rather than consuming it in large quantities. Have a look at some of the most commonly observed side effects of flax seed mentioned below.
Indigestion
Consuming too much of flax seed can cause indigestion and lead to symptoms like bloating, diarrhea, abdominal pain, flatulence and cramps. In fact, people who start consuming flax seed, and introduce it for the first time in their diet, mostly suffer from indigestion.
Obstruction in Digestive Tract
Another side effect of flax seed is that it can cause significant obstruction in the digestive tract and even the throat of a person. This happens specially in cases wherein people consume it in the powdered form. Flax seed tends to swell up when consumed and tends to get stuck in the digestive tract creating an obstruction, therefore you should consume a lot of water while consuming it to avoid this side effect.
Laxative Effects on the Body
Flax seed is known to have a laxative effect on the body as it tends to increase the bowel movements of a person which can result in diarrhea. Therefore, if you are suffering from certain intestinal problems like inflammatory bowel disease (IBD), stomach ulcers, Crohn's disease, then it is advisable not to consume flax seed.
Bleeding in the Brain
In rare cases, the use of this seed may induce bleeding in the brain. This is known as hemorrhagic stroke, clinically. The classic symptoms include changes in vision, weakness, feeling of numbness in limbs, severe headache and changes in speech.
Gastrointestinal Bleeding
Gastrointestinal bleeding may also be one of the severe side effects of flaxseed oil pills. This may be indicated by black or tarry stools. In some cases, there might be a small amount of bright red blood in the stool.
Other Blood Disorders
Consumption of flax seed also makes a person prone to suffer from blood related problems. This is why experts advice people with bleeding disorders, or people those who are consuming blood thinners, not to go for flax seed as it tends to increase blood clotting. It is also not advisable to include this in your diet if you are about to go for some dental or surgical procedure.
Allergic Reaction
Some people may suffer from hives, swelling, wheezing and trouble breathing after taking the flaxseed oil or the seed. These flaxseed side effects are a manifestation of an allergic reaction. Flaxseed is also known to slow down the process of blood clotting and hence, this increases the risk of heavy bleeding and easy bruising.
Toxicity
Don't eat raw or unripe flaxseed. Flaxseed in these forms is thought to be poisonous.
Don't use flaxseed oil to cook since the heat changes the healthy fat into toxic fat that causes harm. Instead, most people find that adding the oil to a dish that's already cooked can enhance the flavor and add many beneficial nutrients to the diet.
Pregnancy and Breast-feeding
Taking flaxseed by mouth during pregnancy is POSSIBLY UNSAFE. Flaxseed can act like the hormone estrogen. Some healthcare providers worry that this might harm the pregnancy, although to date there is no reliable clinical evidence about the effects of flaxseed on pregnancy outcomes. The effect of flaxseed on breast-fed infants is unknown at this time. Stay on the safe side, and don't use flaxseed if you are pregnant or breast-feeding.
Other Health Conditions
Apart from the aforementioned side effects, other possible side effects of consuming flax seed include, allergic reactions, changes in the menstrual cycle in women, as flax seed also affects the estrogen levels in the body causing hormonal imbalance. Some say that flax seed also triggers thyroid problems in people. Therefore, you must consult with your doctor about your individual health condition and the doses are safe to consume, if you have to consume it at all!
http://www.seedguides.info/flax-seed/