A.T. Robertson Commentary 1 Thessalonians 3:7

"for this cause, brethren, we were comforted over you in all our distress and affliction through your faith:" — 1 Thessalonians 3:7 (ASV)

Over you (εφ' υμιν). Επ with the locative, the basis on which the "comfort" rests.

In (επ). Locative case again with επ.

Distress (αναγκη).

Physical necessity , common sense in late Greek, choking (αγχω, ανγορ), and

crushing trouble (θλιψισ, θλιβω).