tummy / belly = masu / maha
belly button = napa
wrist = ranne 
thum = peukalo
forefinger = etusormi
middle finger = keskisormi
ring finger = nimetön
little finger / pinkie = pikkurilli
plaster / bandaid = laastari
triangular bandage = kolmioliina
You need to go to the A&E (accidents and emergencies) /ER (emergency room) = ensiapu (paikka)
first aid = ensiapu (hoito)
health center = terveyskeskus
healthy = terveellinen
block of flats = kerrostalo
a flat = huoneisto
Please, have a seat / take a seat = olkaa hyvä ja istuutukaa
I am allergic to milk / celeriac / citrus fruit.
I have many allergies.
I can't eat any celeriac.