If you experience several of these symptoms, you may have an underactive thyroid. I know, these are not labs and this is not a scientific survey. But these symptoms are a culmination of lists from very trusted resources. ‘Tis true that many of these issues can be caused by other factors, certainly.

You can click here for a thyroid self-test.
 
Please remember that this list is for your informational purposes and is not meant to be a substitute for the advice and treatment provided by a physician or other medical professional.
 
Here goes:
 
I am gaining weight inappropriately
I am unable to lose weight with diet/exercise
I am exhausted after exercise/not rejuvenated
I am constipated, sometimes severely
My mouth is often dry
I have hypothermia/low body temperature (I feel cold when others feel warm, I need extra sweaters, etc.)
I have cold hands and feet
I am feeling run down, sluggish, lethargic, exhausted
I have low stamina
I am bone tired in the morning
I am getting more difficult to get along with
I am becoming more irritable and judgmental
I am getting more impatient
I am lacking motivation
I nod off easily
I am not sleeping that great
I can’t stand for long periods of time
I have difficulty concentrating
I can’t read for long periods of time
I have excessive anxiety/worry
I am developing food sensitivities
I am becoming more sensitive to caffeine
I have IBS
I am not that hungry in the morning
I get really hungry before bedtime
I have mad cravings
My hair is coarse and dry, breaking, brittle
I am going prematurely grey
My hair is falling out
My skin is coarse, dry, and scaly
My nails are peeling
I have acne on my face, chest, or arms
I have a hoarse or gravely voice
I have edema/puffiness/swelling
I have bumps/pits on my legs
I have puffiness and swelling around the eyes and face
I have no eyebrows or my outer eyebrows are thinning
I am having trouble conceiving a baby
I have had miscarriages
I have severe menstrual cramps
I am having irregular menstrual cycles (longer, or heavier, or more frequent)
I have bad PMS
I am estrogen dominant
I am not ovulating
I have no sex drive
I have pains/aches in joints
My bones ache
My feet are sometimes swollen
My eyelids are swollen upon waking
I have poor ankle reflexes
I am osteoporotic
I have developed carpal-tunnel syndrome, or it's getting worse
I have muscle stiffness
I have muscle pain
I feel blue/depressed
I feel restless
My moods change easily
I have feelings of worthlessness
I have more feelings of sadness
I seem to be losing interest in normal daily activities
I am more forgetful late
I am getting more frequent infections
I am snoring more
I have/may have sleep apnea
I feel shortness of breath and tightness in the chest
I feel the need to yawn to get oxygen/have feelings of air hunger
My eyes feel gritty and dry
My eyes feel sensitive to light
My eyes get jumpy/I have tics in eyes
I feel dizzy or have vertigo
I have regular headaches or migraines
I have tinnitus (ringing in ears)
I have a cold fanny
I get recurrent sinus infections
I feel some lightheadedness
I occasionally have vertigo

And to think that for many people, hypothyroidism goes undiagnosed and undertreated for years...