Sforno on Exodus 14:24/ספורנו על שמות י״ד:כ״ד

1וישקף ה' אל מחנה מצרים בעמוד אש וענן, the two pillars which were moving halfway between the Egyptians and the Israelites, He now brought much closer to the Egyptian camp.

2ויהם, by means of a variety of diseases, similar to what G’d did to the Philistines who had captured the Holy Ark in Samuel I 5,9 where these afflictions, especially painful hemorrhoids are detailed. These afflictions are referred to in the Torah as מדוי מצרים הרעים, the terrible sicknesses of Egypt (Deut. 7,15). This was part of the היד הגדולה אשר עשה ה' במצרים, “the great hand which G’d employed against Egypt.” (verse 31 our chapter). In Deuteronomy 28,60 Moses recalls that the Israelites dreaded these illnesses. However, during the 10 plagues the details of which have been listed by the Torah, we find only a single such affliction infecting the bodies of the people seriously, i.e the 6th plague, שחין. The Torah refers separately to שחין מצרים and to מדוי מצרים.