Mér er illt í bakinu eftir langan göngutúr.

My back hurts after a long walk.

Breakdown of Mér er illt í bakinu eftir langan göngutúr.

• ég: I
• eftir: after
• langur: long
• göngutúrinn: the walk

Questions & Answers about Mér er illt í bakinu eftir langan göngutúr.

Why is it mér and not ég?

Because Icelandic often expresses physical sensations with a dative experiencer rather than a nominative subject.

• ég = I (nominative)
• mér = to me / for me (dative)

So Mér er illt is literally something like It is painful for me or I feel pain, not a direct I hurt structure.

This same pattern appears in very common sentences like:

• Mér er kalt = I am cold
• Mér er heitt = I am hot
• Mér er illt = I am in pain / it hurts

Why does Icelandic use er here instead of a verb meaning hurt?

Because this is a very common Icelandic way to describe a bodily state: dative pronoun + vera + adjective.

So instead of building the sentence around a verb like English hurt, Icelandic often says something closer to:

• to me is painful
• to me is cold
• to me is bad

In this sentence:

• Mér = to me / for me
• er = is
• illt = painful / bad

That whole chunk, Mér er illt, functions like I’m hurting / I’m in pain.