Verses with the word sickness in the Old Testament (15 verses):

Exodus 23:25
And ye shall serve the LORD your God, and he shall bless thy bread, and thy water; and I will take sickness away from the midst of thee.

Leviticus 20:18
And if a man shall lie with a woman having her sickness, and shall uncover her nakedness; he hath discovered her fountain, and she hath uncovered the fountain of her blood: and both of them shall be cut off from among their people.

Deuteronomy 7:15
And the LORD will take away from thee all sickness, and will put none of the evil diseases of Egypt, which thou knowest, upon thee; but will lay them upon all them that hate thee.

Deuteronomy 28:61
Also every sickness, and every plague, which is not written in the book of this law, them will the LORD bring upon thee, until thou be destroyed.

1 Kings 8:37
If there be in the land famine, if there be pestilence, blasting, mildew, locust, or if there be caterpiller; if their enemy besiege them in the land of their cities; whatsoever plague, whatsoever sickness there be;

1 Kings 17:17
And it came to pass after these things, that the son of the woman, the mistress of the house, fell sick; and his sickness was so sore, that there was no breath left in him.

2 Kings 13:14
Now Elisha was fallen sick of his sickness whereof he died. And Joash the king of Israel came down unto him, and wept over his face, and said, O my father, my father, the chariot of Israel, and the horsemen thereof.

2 Chronicles 6:28
If there be dearth in the land, if there be pestilence, if there be blasting, or mildew, locusts, or caterpillers; if their enemies besiege them in the cities of their land; whatsoever sore or whatsoever sickness there be:

2 Chronicles 21:15
And thou shalt have great sickness by disease of thy bowels, until thy bowels fall out by reason of the sickness day by day.

2 Chronicles 21:19
And it came to pass, that in process of time, after the end of two years, his bowels fell out by reason of his sickness: so he died of sore diseases. And his people made no burning for him, like the burning of his fathers.

Psalms 41:3
The LORD will strengthen him upon the bed of languishing: thou wilt make all his bed in his sickness.

Ecclesiastes 5:17
All his days also he eateth in darkness, and he hath much sorrow and wrath with his sickness.

Isaiah 38:9
The writing of Hezekiah king of Judah, when he had been sick, and was recovered of his sickness:

Isaiah 38:12
Mine age is departed, and is removed from me as a shepherd's tent: I have cut off like a weaver my life: he will cut me off with pining sickness: from day even to night wilt thou make an end of me.

Hosea 5:13
When Ephraim saw his sickness, and Judah saw his wound, then went Ephraim to the Assyrian, and sent to king Jareb: yet could he not heal you, nor cure you of your wound.