Jhāna constipation and blocked Passaddhi
The physical symptoms as one attains and progresses through the 4 jhānas
(note this article is work in progress)
Unlike some of the Taoist and Hindu meditation systems that explain in detail what's happening with subtle energy and resulting physical symptoms as one attains and progresses through the four jhānas, in the EBT there's no detail, just some hints and suggestions at what's going on underneath the hood. This article will collect all the known relevant sutta references.
Water in the 4 jhana similes, represents piti and sukha (rapture and pleasure). The force of the water feels hydraulic, like you're sitting under a water fall, or sitting in a jacuzzi right on to of some of the jets of water shooting up your spine.
simile of river split into 5: describes how the 5 hindrances divert the power of a single mighty river. That is, if the river does not split into 5, the force of the water is much greater.
Kappina: (name of monk)
no shaking or trembling in body (or mind). When most people are getting close to or experiencing immature first jhana, the energy channels have blockages that cause the strong hydraulic forces of fluid flow to rebound and make various parts of the body vibrate, shake, tremble. This sutta is describing that.
Pañcaṅgikasamādhi [Pañcaṅgika]: (has famous 4 jhana similes) + 5th reviewing sign
1st jhana, water is weak, and requires a person's vitakka and vicara (thought and evaluation) to apply the water to the soap powder and bind it.
2nd jhana, power is strong, feeling is hydraulic, the simile of sitting on a lake fed by a spring, is really accurate. It can feel like jacuzzi jets of water shooting up your spine, the force of the water flow is so strong.
3rd. jhana, the vibrational and flow of the water has smoothed out, it feels like a pond of still water that completely pervades the entire body.
Nīvaraṇa (hindrances) Vagga 6
Nīvaraṇa [Āvaraṇa]: 5 hindrances (+ simile of river split/united in 5)
Caṅkamānisaṃsa [Caṅkama]: 5 benefits of walking meditation