Miralax? Should I be worried?

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I've had chronic constipation for a few weeks now. I was rally backed up when I went to the ER 2 weeks ago, and I've been going but only a little everyday. I had an enema and magnesium citrate at the hospital 2 weeks ago, which only got rid of a little. The past two weeks my doctor started prescribing miralax, which the past 2 days I've been taking 2 capfuls per day. When I get that sick feeling like diahhrea, but it comes out with a lot of gas and is pencil thin and soft. I've been worrying about colon cancer, so is this because of the miralax or something worse like cancer? It started becoming really thin and short, and has been for the last 3-4 days (while taking the 2 capfuls of miralax). I know it's not an obstruction since I had an x Ray at the ER today and he said he didn't feel anything hard or mass like when feeling my stomach. I said my stools were thin, and he didn't really say anything about it. I've looked up online and some others had said when taking miralax their stools were pencil thin and short. Is this because of the miralax? Should I be worried? I'm 17 years old by the way, and I don't have any family history of cancer, but I do have an eating disorder (anorexia) which I think is a part of my bowel issues. The other symptoms I have are just back pain and some has pain, but again my doc said that's probably from the constipation. Does everything seem fine? I just hate when I look up thin stool, colon cancer pops up.

Actually, I eat 3000 calories a day as I'm recovering from anorexia and am trying to gain weight, which can also be a reason why im constipated since I'm recovery constipation is very common. The thin small stools started the day I started taking the miralax, which I don't really think was coincidental, and I've seen lots of reviews of people having the same issue with the size of the stools. And yes I drink lots of water, I think miralax is the problem since I'm taking twice the dosage and I'm small (I only weight 88 pounds at the moment), so I hope it's just because of that. Thank you for replying!

I have to take Linzess and Miralax dally for my IBS with constipation. Yes the Miralax can give you thin runny stools but that's better than being constipated for days.. Tonight I'm just getting over an 'episode' that started late last night.. I've been dealing with this for years and in the beginning I had many hospital stays.. Now I have my 'emergency' meds I use along with a nice hot bath.. Somehow the hot water takes the pain away.. Yes I get dehydrated so I know I have to watch that..
I spent at least 18 of the last 24 hours in the shower/tub.. As I sit here with a heating pad on my belly I can still feel burning in my belly.. I know I need to start really watching what I eat.. I'm new to this

Hiya, I am 19 years old and have same issue with thin stools. I have had a colonoscopy and MRI scan that has shown nothing. However my MRI scan was limited looking at my small intestines as the solution just wanted to sit in my stomach. I have been having nausea, gas, abdominal pain, thin stools for the past 5 months!!! I have not been taking Miralax though. I am actually having a pillcam tomorrow morning to see what is going on with my digestive system. The only reason they are concerned is because my faecal calprotectin test is quite high on two occasions. Dont stress yoourself about colon cancer as the chances of that are very very very slim at our age! Also dont use Dr. google! Currently they think i may have ulcers from taking ibrofen over a long period of time. Or crohns...or IBS...so we will see! Let me know if you find out any information with your health.