What is shabq, and does it permit breaking the fast?
Machine translationRead the Arabic original
Question : Shabq.
Answer : If he fears that his testicles will crack due to shabq, he may break his fast. Shabq is an illness, not merely intense desire; rather, it is a disease. Some of those afflicted with it told us—may Allah grant us well-being—that as soon as he desires and his passion rises, fluid descends into the scrotum, causing it to swell greatly until it is released. Such a condition is a severe illness, may Allah grant us well-being. If he fears that his testicles will crack, he may break his fast, for this is among the most severe illnesses. He must make up the fast, because he is concerned for his safety, resembling a sick person.
Answer : If he fears that his testicles will crack due to shabq, he may break his fast. Shabq is an illness, not merely intense desire; rather, it is a disease. Some of those afflicted with it told us—may Allah grant us well-being—that as soon as he desires and his passion rises, fluid descends into the scrotum, causing it to swell greatly until it is released. Such a condition is a severe illness, may Allah grant us well-being. If he fears that his testicles will crack, he may break his fast, for this is among the most severe illnesses. He must make up the fast, because he is concerned for his safety, resembling a sick person.
Source
قناة «فضيلة الشيخ محمد بن صالح العثيمين»، 2015 - ما هو الشبق وهل يبيح الفطر؟ الكافي في فقه الإمام أحمد بن حنبل - ابن عثيمين — youtube.com
The Arabic text is a machine transcription of the audio recording.