Braxton Hicks contractions:
are infrequent, usually happening no more than once or twice an hour, a few times a day
often stop if you change activity, so, walk around if you've been sitting, and vice versa
are usually irregular, and if they are regular they only stay that way for a short spell
do not last long, usually less than a minute
continue to be unpredictable and non-rhythmic
do not increase in intensity
Compared to Braxton Hicks contractions, labour contractions are usually:
noticeably longer
more regular
more frequent
more painful
keep on going, increasing in frequency, duration, and intensity as time goes on
You may experience what is called false labour. This is when Braxton Hicks contractions come more rhythmically, perhaps every 10 to 20 minutes in late pregnancy.
False labour can be hard to tell apart from early labour, particularly if the tightening of your uterus feels uncomfortable. However, during false labour your cervix won't have started to change yet.
As your pregnancy progresses, these contractions may become more intense and even painful at times. When this happens, they may feel like the real thing. But however strong they feel at the time, if they ease off, they are probably Braxton Hicks.