In this podcast, we talk about the difference between PMS (premenstrual syndrome) and perimenopause.  We get this question all the time, Doc, I think I am going into menopause.' When really, they are nowhere near menopause, let alone perimenopause. What makes it so confusing is that there are so many similarities between PMS and perimenopause.
But some distinctions are important to point out, especially when it comes to testing and treatment. PMS (premenstrual syndrome) is pretty much as it sounds.  Symptoms appear prior (pre) to the period (menses). But usually, the symptoms appear in a cyclical pattern.
The symptoms will appear anywhere from 14 days to just a couple of days before the period. The distinction between PMS and perimenopause, is the symptoms are present all month in perimenopause.
Perimenopause is NOT menopause.  It is the time before a woman enters menopause.  It can be anywhere from age late 30's to late 40s.  In perimenopause, you are still getting your period (it might be irregular, but you are STILL getting your period).        
But the symptoms between PMS and perimenopause are similar.
So just to reiterate:

Symptoms in PMS occur between 14 days to 2 days before your period.
Symptoms in perimenopause occur all month long.

Symptoms that are similar in PMS and perimenopause:

Irritability: patience is short.  Becomes easily irritated, even at situations that it is not warranted.  Of course, you feel guilty after having a hormonal tantrum and cry and feel badly about the encounter.  You are not crazy, it is your hormones.
Acne
Carb cravings
Sleep issues –waking in the middle of the night and cannot go back to sleep
Fatigue: low energy–both physically and mentally tired
Anxiousness not always warranted for the situation
Bloated: even though your bowels are moving fine
Cramping before period even starts

Symptoms that are different between PMS and Perimenopause

All of a sudden your periods get weird.  Periods come early or late. Your spot for days.  One month your period is super heavy, and the next kinda light.  Every month can be different in perimenopause.
Crampy painful periods
Symptoms all month long in perimenopause–it is like #pmsallmonthlong
Symptoms 14 days to 2 days before your period
Hair loss